水华蓝藻生物质对沉水植物五刺金鱼藻生长的影响
EFFECT OF WATER BLOOM2FORMING CYANOBACTERIAL BIO2SUBSTANCES ON THE GROWTH OF SUBMERGED MACROPHYTE CERATOPHY LLUM ORYZETORUM K OM.
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摘要: 本文研究了蓝藻水华不同的生物质形式对金鱼藻生长和光合活性的影响,结果表明:蓝藻水华的不同生物质形式均不同程度地促进了金鱼藻的生长。在促进金鱼藻植株的长度增长方面,干燥蓝藻的作用最强,新鲜蓝藻次之,腐烂蓝藻作用最弱,但都比对照增长显著。而在促进金鱼藻植株鲜重增长上,干燥蓝藻和新鲜蓝藻的作用几乎相同,为最为明显的;腐烂蓝藻次之;而对照植株的鲜重先增加后下降。在促进金鱼藻分枝上,新鲜蓝藻的作用最强,干燥蓝藻和腐烂蓝藻次之,对照的分枝随时间也逐渐增加,但是要比经过蓝藻处理的试验组少。测定的叶绿素荧光参数表明,干燥蓝藻处理的金鱼藻的光合活性最高,新鲜蓝藻处理组次之,腐烂蓝藻和对照组最低。实验结果表明,不同水华蓝藻生物质在为金鱼藻提供生长所需的营养(或生长促进物质)之时,也产生了一些抑制因素,抑制了金鱼藻的生长。促进因素和抑制因素的协同作用,最终表现在不同生物质对金鱼藻的生长促进作用的差异性上。Abstract: The different forms of cyanobacterial bio-substances on the growth and photosynthetic activityof submerged macrophyte Ceratophyllum oryzetorum K om was investigated in present study. Results showed that all kinds of cyanobacterial bio-substances ould enhance the growthof C. oryzetorum K om. differently. Compared with the control, the plant lengthof C. oryzetorum could be increased by all forms of bio-substances, in which the dry algal material has the strongest effect, while the decomposed material has the lowest. The fresh weight of C. oryzetorum also could be promoted by all kinds of algal bio-substances, in which the dry algal material and the fresh algal material almost have the same obvious effect, and the decomposed algal material has the lowest, while in control, the fresh weight firstly increased, and then decreased. All forms of cyanobacerial material could promote the increase of branches in C. oryzetorum, in which the fresh algal material has the strongest effect and the dry and decomosed materials lower, while in control, the branches increased also less than the algal material treated groups. The photosynthetic activity expressed by chlorophyll fluorescence suggested that the dry algal material treated C. oryzetorum had the highest activity, and the fresh algae treatedone lower, and the decomposed algae and the control treatedones were the lowest. In conclusion, the different forms of cyanobacterial bio-substances could supply nutrients or growth promotersfor C. oryzetorum to grow, and at the same time, other growth inhibiters might exist to inhibit the growth of C. oryzetorum. Factors of promoting and inhibiting worked together, thus resulted in the different promoting effects by different forms of cyanobacterial bio-substances to the growth in C. oryzetorum.
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